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Service Registration
Service Deregistration
Service Request
Service Type Request
Attribute Request
Novell's Enhancements to SLP
A Service agent forwards all known services to the Directory agent using a
service register request. The register contains the URL, attributes, language
indicator, and a time to live (lifetime). The service registration occurs when
attributes are being updated or modified and once every lifetime period.
A Service agent sends a service deregister request to the Directory agent when
the service is no longer available.
A User agent sends a service request to the Directory agent when it is looking
for services. The Directory agent returns only those services with a valid
lifetime. The User agent might filter services by providing a predicate list. The
Directory agent must filter services when the predicate list is supplied.
A user agent sends a service type request to the Directory agent when it is
looking for all service types or all service types within a specific name
authority.
A User agent sends an attribute request to the Directory agent either for a
specific URL or for a group of URLs specified by the service type.
As mentioned previously, once the SLP service information has been stored in
the NDS tree, the normal replication and distribution processing of NDS will
guarantee its global accessibility. Only those Directory agents granted access
rights to the Scope container object will have access to the SLP service
information in that scope.To reduce bandwidth requirements on large
networks, the NetWare SLP Directory agent doesn't use IP multicast. In a
small network, IP multicast is a viable technology that can be coupled with the
SLP user and Service agents to provide acceptable discovery service. As the
network expands, the IP multicast can cause some bandwidth reduction, as
Understanding Network Communications
19
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